<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			let a = 3;
			a =4 ;
			
			a +=4 ; // a= a+4;
			alert(a)
		</script>
	</body>
</html>
